Filtering method and system integrating in-situ ultrasonic cleaning and compartment off-line backwashing

Abstract

The invention discloses an in-situ ultrasonic cleaning and compartment off-line backwashing integrated filtering method and system, and relates to the technical field of solid-liquid separation. The method comprises the stages of filtration, compartment off-line backwashing, in-situ ultrasonic cleaning and sludge treatment, wherein during filtration, impurities in sewage are intercepted by a filter element, and purified water is discharged; the backwashing can be used for purifying water for a single unit and an intercepting system or supplying water by an external water pump, and reversely washing and removing impurities; ultrasonic cleaning excites a cavitation effect through a vibration plate, scales and deep impurities of the filter element are stripped in situ, and the ultrasonic cleaning and backwashing are carried out in a peak shifting manner; and the sludge is pumped and discharged to the solid-liquid separation device regularly. The system comprises a backwashing pipeline, a purified water outlet system, a filter unit assembly, an ultrasonic cleaning device and an electric control device. According to the invention, single-chamber off-line backwashing can be realized without additional complex equipment, non-stop continuous operation of the system is realized, a high-efficiency environment-friendly method is adopted for descaling, the adaptive scene is wide, the automation degree of the system is high, and long-term stable operation of attended operation and unmanned operation can be realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of solid-liquid separation, and particularly relates to a filtering method and system integrating in-situ ultrasonic cleaning and chamber offline backwashing. BACKGROUND

[0002] Many production processes and production equipment of industrial and mining enterprises will produce wastewater or sewage of different sizes during use. In order to protect the environment or save water resources, etc., it is usually necessary to purify and treat these wastewater and sewage by using various processes. In these purification processes, the filtration process is the most widely used. The filtration method is to intercept the suspended solids and particulate matter in the water by using the medium, and the purified water passes through the medium to achieve solid-liquid separation. According to the different filtration media, there are mainly biological filter, filter screen filtration, membrane filtration and other technologies. No matter which kind of filtration way, the filtration flux will be continuously reduced due to the continuous deposition of particulate matter on the surface. Therefore, the filtration element needs to be cleaned to restore the filtration flux.

[0003] For a large-capacity filtration system, multiple filtration units are combined to form a filtration system. In order to solve the cleaning of the filtration element of the combined structure filtration system and ensure that the entire system runs without stopping during cleaning, the applicant proposed a chamber backwashing technology for the filtration element (plug-in flat membrane assembly) in patents 202511042964.7 and 202521583215.0. Since a backwashing water tank and a backwashing dedicated water pump need to be configured, the backwashing system is relatively complex. At the same time, due to the large number of backwashing times, the frequent start and stop of the backwashing water pump has a large impact on the system.

[0004] In addition, calcium and magnesium ions in the water will form scale on the surface of the filtration element during long-term operation of the filtration system. Even through backwashing, it is difficult to remove, and chemical agents need to be used for treatment. In this way, not only will there be residual agent components in the water, but also it will affect the continuous operation of the system. In industrial and mining enterprises, ultrasonic waves are usually used to clean the dirt on the surface of mechanical parts that are difficult to clean. The cleaning process is to put the dirty parts into the water tank of the ultrasonic cleaner, take them out after cleaning, and then replace them with another or another batch for cleaning. This cleaning method has a large workload for disassembling and taking out the filtration elements for the filtration system with many filtration elements, and it is also easy to damage the filtration elements. SUMMARY

[0005] Therefore, the present application provides a filtering method and system integrating in-situ ultrasonic cleaning and chamber offline backwashing, which solves the problems of complex additional equipment for chamber backwashing, frequent start and stop of the water pump impacting the system, difficult removal of scale, pollution of water quality by chemical cleaning and the need for disassembly during shutdown, poor adaptability of traditional ultrasonic cleaning, poor coordination between cleaning and system operation, and the difficulty in balancing the effect and continuous operation.

[0006] In order to achieve the above object, the present application provides the following technical scheme: a filter method integrating in-situ ultrasonic cleaning and compartmental offline backwashing, comprising the following steps: a filtering stage: all backwashing water inlet valves in the backwashing pipeline system are closed by an electric control device, all clean water outlet valves in the clean water outlet system are fully opened, sewage enters a filter unit assembly through a water inlet pipeline, flows through a filter element under the action of a pressure difference, suspended particulate matters and impurities are intercepted, clean water passes through the filter element into a clean water chamber, and finally is discharged through a clean water outlet pipeline; a compartmental offline backwashing stage: when impurities accumulated on the surface of the filter element cause a decrease in the filtration flux, the electric control device selects a single filter unit to be backwashed, controls the clean water outlet valve and the sewage water inlet valve of the filter unit to be closed synchronously, and the remaining filter units remain in the filtering state; the clean water in the interception system is adjusted through a flow control valve, so that the backwashing water enters the clean water chamber of the filter unit to be backwashed through the backwashing pipeline, passes through the filter element in the opposite direction of the filtering direction, peels off the surface-intercepted impurities, and the impurities are deposited with the water flow to a sludge storage space; an in-situ ultrasonic cleaning stage: for the scale and deep impurities on the surface and internal pores of the filter element, the electric control device selects a single filter unit to be cleaned, controls the sewage water inlet valve, the clean water outlet valve and the backwashing water inlet valve of the filter unit to be closed, so that the filter unit stops filtering and backwashing operation and remains in a relatively static state; an ultrasonic cleaning device is started, cavitation effect of water in the filter chamber is excited through an ultrasonic vibration plate, and the impact force generated by bubble generation and rupture is used to peel off the scale and deep impurities on the filter element; a sludge treatment stage: a sludge discharge pump is started regularly, the sludge generated by backwashing and ultrasonic cleaning is discharged from the sludge storage space to an external solid-liquid separation device through a sludge discharge pipe, and separation of the sludge and the water body is realized; The compartmental offline backwashing stage and the in-situ ultrasonic cleaning stage are not performed at the same time.

[0007] As a preferred scheme of the filter method integrating in-situ ultrasonic cleaning and compartmental offline backwashing, in the filtering stage, the filter unit assembly is an I-shaped structure filter unit installed in a submerged manner or a II-shaped structure filter unit installed on the ground or in the air; When the I-shaped structure filter unit is adopted, the sewage enters the pool through a sewage water inlet main pipe, and converges to the filter chamber relying on the water body; When the II-shaped structure filter unit is adopted, the sewage enters the hopper through the sewage water inlet main pipe, a sewage water inlet branch pipe and a sewage inlet, and is then guided to the filter chamber.

[0008] As a preferred embodiment of the filtration method integrating in-situ ultrasonic cleaning and compartment offline backwashing, the backwashing water is supplied in two ways during the compartment offline backwashing stage: First, the opening of the flow control valve is adjusted by an electronic control device to reduce the amount of clean water discharged, and a portion of the water is diverted to enter the backwashing main pipe through the backwashing connection pipe, and then enters the filter unit to be backwashed through the backwashing branch pipe and the backwashing inlet valve; Second, the external water pump is connected to the backwashing connection pipe, and pressurized water is provided by the external water pump and delivered to the backwashing main pipe.

[0009] As a preferred solution for filtration methods that integrate in-situ ultrasonic cleaning and compartmentalized offline backwashing, the ultrasonic cleaning device operates as follows: the ultrasonic generator generates a high-frequency vibration signal, which is transmitted through a shielded cable to ultrasonic plates fixed on both sides or around the filter element in the filter chamber. The ultrasonic plates transmit the vibration to the water, forming a uniform ultrasonic field that acts on the filter element.

[0010] As a preferred embodiment of the filtration method integrating in-situ ultrasonic cleaning and compartmented offline backwashing, in the sludge treatment stage: When using the Type I structure filter unit, the filter unit is installed in the water tank through a bracket, and the bottom of the filter unit is at a preset height with the bottom of the tank to form a sludge storage space. When using a Type II structure filter unit, the hopper connected below the filter chamber serves as a sludge storage space, and the wastewater inlet valve corresponding to the hopper remains closed during backwashing.

[0011] This invention also provides a filtration system integrating in-situ ultrasonic cleaning and compartmented offline backwashing, comprising a backwash pipeline system, a purified water outlet system, a water pump, a flow control valve, a backwash connection pipe, a sludge pump, and a filter unit assembly. The filter unit assembly is either a submerged Type I structure filter unit or a ground-mounted Type II structure filter unit. The backwash pipeline system includes a backwash main pipe, backwash branch pipes, and a backwash inlet valve. The Type I structure filter unit forms filtration system one through the backwash pipeline system, the purified water outlet system, the water pump, the flow control valve, the backwash connection pipe, and the sludge pump. The Type II structure filter unit forms filtration system two through the backwash pipeline system, the purified water outlet system, the water pump, the flow control valve, the backwash connection pipe, the sludge pump, the sewage inlet main pipe, the sewage inlet branch pipes, and the sewage inlet valve.

[0012] As a preferred embodiment of an in-situ ultrasonic cleaning and compartmented offline backwashing integrated filtration system, both the Type I and Type II structure filtration units include a filter chamber, a filter element, a perforated plate, a clean water chamber, an inspection port cover, a backwash water inlet, and a clean water outlet. The perforated plate is horizontally positioned inside the filtration unit, vertically separating the clean water chamber and the filter chamber into two independent spaces. The filter element passes vertically through the perforated plate, with its upper end fixed inside the clean water chamber and its lower end extending into the filter chamber. The backwash water inlet is connected to one side of the clean water chamber, and the clean water outlet is connected to the other side. The inspection port cover is located on the top of the clean water chamber. A housing support is also fixedly connected to the bottom of the Type II structure filtration unit. A hopper is welded below the filter chamber, with a wastewater inlet connected to one side of the hopper and a sludge outlet connected to the bottom of the hopper.

[0013] As a preferred embodiment of the filtration system integrating in-situ ultrasonic cleaning and compartmentalized offline backwashing, in the backwashing pipeline system, one end of the backwashing branch pipe is welded to the backwashing main pipe, and the other end of the backwashing branch pipe is connected to the backwashing water inlet of the filter unit assembly through the backwashing inlet valve; the purified water outlet system includes a purified water outlet main pipe, purified water outlet branch pipes, and purified water outlet valves, one end of the purified water outlet branch pipe is welded to the purified water outlet main pipe, and the other end of the purified water outlet branch pipe is connected to the purified water outlet of the filter unit assembly through the purified water outlet valves; the water pump inlet pipe of the water pump is connected to the purified water outlet main pipe, and the water pump outlet pipe of the water pump is connected to the backwashing connection pipe and the purified water discharge / reuse pipe respectively through a tee, and the flow control valve is connected to the purified water discharge / reuse pipe.

[0014] As a preferred embodiment of the filtration system integrating in-situ ultrasonic cleaning and compartmentalized offline backwashing, it also includes an ultrasonic cleaning device, which includes an ultrasonic generator and an ultrasonic transducer plate. The ultrasonic generator and the ultrasonic transducer plate are detachably electrically connected by a shielded cable. The ultrasonic transducer plate is fixed to the inner walls of the left and right sides or the perimeter of the filter element in the filtration chamber by bolts.

[0015] As a preferred embodiment of the filtration system integrating in-situ ultrasonic cleaning and compartmentalized offline backwashing, the ultrasonic generator of the Type I structure filtration unit is fixedly installed on the outside of the water tank by a bracket and electrically connected to the ultrasonic transducer plate in the filtration chamber by a cable; the ultrasonic generator of the Type II structure filtration unit is fixed to the outer wall of the housing on the outside of the filtration chamber by bolts and electrically connected to the ultrasonic transducer plate in the filtration chamber by a cable.

[0016] As a preferred solution for an in-situ ultrasonic cleaning and compartmentalized offline backwashing integrated filtration system, it also includes an electronic control device. When the system is in filtration mode, the electronic control device controls all backwash inlet valves in the backwash pipeline system to close, and stops water supply to the backwash main pipe and backwash branch pipes. At the same time, the electronic control device controls all clean water outlet valves to open fully, and the sewage inlet main pipe supplies sewage to the Type II structure filter unit through the sewage inlet branch pipe and sewage inlet valve. The sewage flows sequentially through the filter chamber, filter element, and clean water chamber, and is finally discharged through the clean water outlet branch pipe and clean water outlet main pipe. When the system is in backwashing mode, the electronic control device controls the individual filter units to be flushed one by one, while the remaining filter units remain in filtration mode. The clean water outlet valve and backwash inlet valve of the filter unit being backwashed are opened and closed at different times through the electronic control device, and the corresponding sewage inlet valve is closed synchronously to cut off the sewage supply.

[0017] As a preferred solution for an integrated filtration system combining in-situ ultrasonic cleaning and compartmented offline backwashing, backwash water is supplied in two ways: First, the opening of the flow control valve is adjusted by an electronic control device to reduce the amount of clean water discharged, and a portion of the water is diverted to enter the backwash main pipe through the backwash connection pipe, and then enters the filtration unit to be backwashed through the backwash branch pipe and the backwash inlet valve; Second, an external water pump is connected to the flange of the backwash connection pipe, and the external water pump provides pressurized water and delivers it to the backwash main pipe.

[0018] As a preferred embodiment of the filtration system integrating in-situ ultrasonic cleaning and compartmented offline backwashing, the Type I filter unit is installed in the water tank via a bracket. The bottom of the filter unit is at a preset height with the bottom of the tank to form a sludge storage space. The sludge storage space is connected to the inlet of the sludge pump via a sludge discharge pipe. The sludge is pumped out by the sludge pump to an external solid-liquid separation device. The Type II filter unit is fixedly installed on the ground or suspended above the water tank via a box bracket. The hopper at the bottom of the filter unit is used to store backwash sludge. The bottom of the hopper is connected to the inlet of the sludge pump via a sludge discharge pipe. The sludge is pumped out by the sludge pump to an external solid-liquid separation device. During backwashing, the wastewater inlet valve corresponding to the hopper remains closed.

[0019] As a preferred solution for a filtration system integrating in-situ ultrasonic cleaning and compartmentalized offline backwashing, the filter element is a tubular or hollow plate structure with a non-soft surface, and the material is selected from stainless steel, composite materials or ceramics. The flange welded to the outer periphery of the upper end of the filter element is fixed above the perforated plate in the water purification chamber by bolts through the upper inspection hole cover plate. The lower end of the filter element passes vertically through the perforated plate and is suspended in the filter chamber. The filter chamber, the water purification chamber, and the perforated plate together constitute the main frame of the filter unit assembly.

[0020] As a preferred embodiment of the filtration system integrating in-situ ultrasonic cleaning and compartment offline backwashing, the offline backwashing of the filtration unit assembly is not performed simultaneously with ultrasonic cleaning. When a designated filtration unit is subjected to ultrasonic cleaning, the electronic control device controls the sewage inlet valve, clean water outlet valve, and backwash inlet valve of the filtration unit to be closed, cutting off the sewage supply to the sewage inlet branch pipe and the backwash water supply to the backwash branch pipe, so that the filtration unit stops filtration and backwashing operations and remains in a relatively static state.

[0021] This invention has the following advantages: First, it has strong applicability. The system consists of multiple filtration units connected in parallel or series to meet the requirements of different water treatment volumes. Different filtration systems can be formed by combining Type I or Type II filtration units, adapting to both submerged and ground-mounted installation scenarios.

[0022] Secondly, it eliminates the need for complex equipment such as backwash tanks. By adjusting the flow rate of purified water discharge / reuse, the filtered water can be directly used for backwashing. This allows for both compartmentalized offline backwashing and continuous system operation. During backwashing, only a single filter unit pauses filtration while the remaining units continue operating normally, ensuring stable filtration performance. This design also simplifies system equipment, saving manufacturing costs and layout space.

[0023] Third, in-situ ultrasonic cleaning is efficient and environmentally friendly. The ultrasonic transducer is fixed in the filter chamber, which can remove scale and deep particles without disassembling the filter element. It replaces chemical cleaning, avoids chemical residues that pollute the water, and reduces the wear and tear of the elements, thus extending their service life.

[0024] Fourth, both the Type I unit and the Type II unit rely on a water tank for sludge storage and a hopper for sludge storage. Both are quickly pumped to the solid-liquid separation device by a sludge pump to avoid sludge accumulation affecting filtration efficiency and further ensure the long-term reliable operation of the system.

[0025] Fifth, the electronic control device links and controls the cleaning and filtration processes to ensure that backwashing and ultrasonic cleaning do not occur simultaneously, and controls the opening and closing of each valve to achieve automated switching of the filtration, backwashing, ultrasonic cleaning and sludge treatment processes. This eliminates the need for frequent manual operation, reduces labor costs, avoids human error, ensures consistency and reliability of operations, and improves operational efficiency. Attached Figure Description

[0026] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0027] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0028] Figure 1 is a schematic diagram of an in-situ ultrasonic cleaning and compartmented offline backwashing integrated filtration system using an I-type structure filtration unit provided in an embodiment of the present invention.

[0029] Figure 2 is a schematic diagram of an in-situ ultrasonic cleaning and compartment offline backwashing integrated filtration system using a type II structure filtration unit provided in an embodiment of the present invention.

[0030] Figure 3 is a front view of the Type I structure filter unit provided in an embodiment of the present invention.

[0031] Figure 4 is a top view of Figure 3 provided in an embodiment of the present invention.

[0032] Figure 5 is a left view of Figure 3 provided in an embodiment of the present invention.

[0033] Figure 6 is a front view of the Type II structure filter unit provided in an embodiment of the present invention.

[0034] Figure 7 is a top view of Figure 6 provided in an embodiment of the present invention.

[0035] Figure 8 is a left view of Figure 6 provided in an embodiment of the present invention.

[0036] Figure 9 is a schematic diagram of the filtration method integrating in-situ ultrasonic cleaning and compartment offline backwashing for the Type I structure filter unit provided in an embodiment of the present invention.

[0037] Figure 10 is a schematic diagram of the filtration method integrating in-situ ultrasonic cleaning and compartment offline backwashing for the Type II structure filter unit provided in an embodiment of the present invention.

[0038] In the diagram: 1. Filter unit assembly; 2. Sewage inlet main pipe; 3. Sewage inlet branch pipe; 4. Sewage inlet valve; 5. Backwash main pipe; 6. Backwash branch pipe; 7. Backwash inlet valve; 8. Backwash connection pipe; 9. Sludge discharge pipe; 10. Sludge pump; 11. Flow control valve; 12. Clean water discharge / reuse pipe; 13. Pump outlet pipe; 14. Pump; 15. Pump inlet pipe; 16. Clean water outlet main pipe. 17. Purified water outlet branch pipe; 18. Purified water outlet valve; 19. Water tank; 101. Box support; 102. Hopper; 103. Filter chamber; 104. Ultrasonic vibrating plate; 105. Filter element; 106. Perforated plate; 107. Purified water chamber; 108. Inspection hole cover; 109. Ultrasonic generator; 110. Backwash water inlet; 111. Purified water outlet; 112. Sewage inlet; 113. Sludge outlet. Detailed Implementation

[0039] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] See Figure 1 and Figure 2 This invention provides a filtration system integrating in-situ ultrasonic cleaning and compartmented offline backwashing, comprising a backwashing pipeline system, a purified water outlet system, a water pump 14, a flow control valve 11, a backwashing connection pipe 8, a sludge pump 10, and a filter unit assembly 1. The filter unit assembly 1 is either a submerged Type I structure filter unit or a ground-mounted Type II structure filter unit. The backwashing pipeline system includes a backwashing main pipe 5, backwashing branch pipes 6, and a backwashing inlet valve 7. The Type I structure filter unit forms filtration system one through the backwashing pipeline system, purified water outlet system, water pump 14, flow control valve 11, backwashing connection pipe 8, and sludge pump 10. The Type II structure filter unit forms filtration system two through the backwashing pipeline system, purified water outlet system, water pump 14, flow control valve 11, backwashing connection pipe 8, sludge pump 10, sewage inlet main pipe 2, sewage inlet branch pipes 3, and sewage inlet valve 4.

[0041] See Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8In one possible embodiment, both the Type I and Type II filter units include a filter chamber 103, a filter element 105, a perforated plate 106, a purified water chamber 107, an inspection hole cover 108, a backwash water inlet 110, and a purified water outlet 111. The perforated plate 106 is horizontally arranged inside the filter unit, dividing the purified water chamber 107 and the filter chamber 103 into two independent spaces. The filter element 105 passes vertically through the perforated plate 106, and the upper end of the filter element 105 is fixed to the purified water chamber 107. Inside 07, the lower end of the filter element 105 extends into the filter chamber 103; a backwash water inlet 110 is connected to one side of the clean water chamber 107, and a clean water outlet 111 is connected to the other side of the clean water chamber 107; an inspection hole cover 108 is provided on the top of the clean water chamber 107; a box support 101 is also fixedly connected to the bottom of the Type II structure filter unit, a hopper 102 is welded below the filter chamber 103, a sewage inlet 112 is connected to one side of the hopper 102, and a sludge outlet 113 is connected to the bottom of the hopper 102.

[0042] Specifically, the perforated plate 106 serves to divide the solid-liquid separation space and fix the filter element 105, dividing the filtration unit into an independent upper and lower filtration chamber 103 and a purified water chamber 107. Wastewater passes through the filter element 105 in the filtration chamber 103, where impurities are trapped, while purified water enters the purified water chamber 107, preventing unfiltered wastewater from mixing with purified water. The filter element 105 is fixed vertically through the perforated plate 106, ensuring element stability and maximizing the filtration area and wastewater contact efficiency. The backwash water inlet 110 and the purified water outlet 111 are located on opposite sides of the purified water chamber 107, ensuring that the backwash water can flush the filter element 105 in the opposite direction to the purified water flow, improving the impurity removal effect.

[0043] The inspection port cover 108 provides a convenient passage for the inspection and replacement of the filter element 105 without disassembling the entire unit.

[0044] The housing support 101 of the Type II unit is used to realize ground / overhead installation, while the hopper 102 stores the sludge generated by backwashing to prevent the sludge from flowing back with the sewage. At the same time, the sludge outlet 113 can quickly discharge the sludge, which is suitable for the centralized sludge treatment needs in ground scenarios.

[0045] In one possible embodiment, in the backwashing pipeline system, one end of the backwashing branch pipe 6 is welded to the backwashing main pipe 5, and the other end of the backwashing branch pipe 6 is connected to the backwashing water inlet 110 of the filter unit assembly 1 through the backwashing inlet valve 7; the purified water outlet system includes a purified water outlet main pipe 16, a purified water outlet branch pipe 17 and a purified water outlet valve 18, one end of the purified water outlet branch pipe 17 is welded to the purified water outlet main pipe 16, and the other end of the purified water outlet branch pipe 17 is connected to the purified water outlet 111 of the filter unit assembly 1 through the purified water outlet valve 18; the water pump inlet pipe 15 of the water pump 14 is welded to the purified water outlet main pipe 16, and the water pump outlet pipe 13 of the water pump 14 is connected to the backwashing connection pipe 8 and the purified water discharge / reuse pipe 12 through a tee, respectively, and a flow control valve 11 is installed on the purified water discharge / reuse pipe 12.

[0046] Specifically, the backwash pipeline adopts a hierarchical structure of main pipe, branch pipes, and valves. The backwash main pipe 5 centrally delivers backwash water, the backwash branch pipes 6 correspond to individual filter units, and the backwash inlet valve 7 can independently control the on / off of backwash water for a single filter unit, providing a control basis for compartmentalized offline backwashing. Only by closing the valves of other branch pipes besides the unit to be backwashed can the flushing of a single filter unit be achieved, while the remaining filter units can filter normally. Similarly, the purified water outlet system has a purified water outlet main pipe 16 that collects purified water from all units, and purified water outlet branch pipes 17 and purified water outlet valves 18 control the discharge of purified water from individual filter units. The water pump inlet pipe 15 connects to the purified water main pipe, allowing the system to intercept its own generated purified water for backwashing without requiring an additional water source. The three-way design of the water pump outlet pipe 13 separates purified water for reuse and backwash water supply. The flow control valve 11, by adjusting the purified water flow rate in the discharge / reuse pipe, controls the amount of water diverted to the backwash connection pipe 8, ensuring sufficient backwash pressure.

[0047] In one possible embodiment, an ultrasonic cleaning device is also included, comprising an ultrasonic generator 109 and an ultrasonic transducer 104, which are detachably electrically connected via a shielded cable; the ultrasonic transducer 104 is fixed to the inner wall of the filter element 105 on the left and right sides or around the filter element 105 in the filter chamber 103 by bolts.

[0048] Specifically, the ultrasonic generator 109 generates high-frequency vibration signals, which are transmitted to the ultrasonic transducer 104 via a shielded cable. The ultrasonic transducer 104 transmits the vibrations to the water in the filter chamber 103, causing the water to generate a large number of tiny bubbles. The rapid generation and collapse of these bubbles generate impact force, which can remove scale and fine particles from the surface and internal pores of the filter element 105. The ultrasonic transducer 104 is fixed to both sides / around the filter element 105, forming a uniform ultrasonic field to ensure that all filter elements 105 can be effectively cleaned. The detachable shielded cable connection facilitates the maintenance and replacement of the ultrasonic generator 109, while the shielding design prevents high-frequency signals from interfering with other electrical components in the system. Cleaning can be achieved without removing the filter element 105 from the system, solving the drawbacks of traditional ultrasonic cleaning that requires frequent disassembly and reassembly of components, and ensuring continuous system operation.

[0049] In one possible embodiment, the ultrasonic generator 109 of the Type I structure filter unit is fixedly installed on the outside of the water tank 19 by a bracket and electrically connected to the ultrasonic transducer 104 inside the filter chamber 103 by a cable; the ultrasonic generator 109 of the Type II structure filter unit is fixed to the box wall outside the filter chamber 103 by bolts and electrically connected to the ultrasonic transducer 104 inside the filter chamber 103 by a cable.

[0050] Specifically, the installation location design of the ultrasonic generator 109 is based on the difference in usage scenarios between the two different structures. The Type I filter unit is submerged in the water tank 19, and the environment inside the water tank 19 is relatively poor. Installing the generator on the ground outside the water tank 19 can avoid short circuits and damage to the generator, and improve the safety and service life of the equipment. The Type II structure filter unit is designed for ground / overhead installation. The outer wall of the filter chamber 103 is dry and has a stable mounting surface. The generator is directly fixed to the chamber wall, which shortens cable length, reduces signal loss, and saves on additional bracket costs. Both installation methods ensure a stable connection between the ultrasonic generator 109 and the ultrasonic transducer 104, and keep it away from the sewage / sludge area of ​​the filter chamber 103, reducing the corrosion or interference of pollutants on the generator and ensuring stable operation of the ultrasonic cleaning function.

[0051] In one possible embodiment, an electronic control device is also included. When the system is in the filtration state, the electronic control device controls all backwash inlet valves 7 in the backwash pipeline system to close, and the backwash main pipe 5 and backwash branch pipe 6 to stop water supply. At the same time, the electronic control device controls all clean water outlet valves 18 to open fully, and the sewage inlet main pipe 2 to transport sewage to the Type II structure filter unit through the sewage inlet branch pipe 3 and sewage inlet valve 4. The sewage flows sequentially through the filter chamber 103, filter element 105, and clean water chamber 107, and is finally discharged through the clean water outlet branch pipe 17 and clean water outlet main pipe 16. When the system is in the backwashing state, the electronic control device controls the individual filter units to be flushed one by one, and the remaining filter units remain in the filtration state. The clean water outlet valve 18 and the backwash inlet valve 7 of the filter unit being backwashed are opened and closed at different times through the electronic control device, and the corresponding sewage inlet valve 4 is closed synchronously to cut off the sewage supply.

[0052] Specifically, the electronic control device achieves automated switching between filtration and backwashing through valve linkage control. In filtration mode, closing all backwash inlet valves 7 prevents water accumulation or leakage in the backwash pipeline from affecting filtration; fully opening the purified water outlet valve 18 ensures smooth discharge of purified water, while wastewater stably enters each filtration unit through tiered pipelines, forming a wastewater inlet, filtration, and purified water outlet process. In backwashing mode, each unit is rinsed individually by opening the backwash inlet valve 7 of the unit to be backwashed separately and closing its purified water outlet valve 18 and wastewater inlet valve 4. This ensures that the backwash water only acts on that filtration unit while ensuring normal filtration in the remaining filtration units, achieving uninterrupted cleaning. The purified water outlet valve 18 and backwash inlet valve 7 are not opened and closed simultaneously to prevent backwash water from mixing with purified water, while the wastewater inlet valve 4 is closed simultaneously to prevent unfiltered wastewater from entering the unit to be backwashed, ensuring backwashing effectiveness and effluent water quality.

[0053] In one possible embodiment, backwash water is supplied in two ways: one is to adjust the opening of the flow control valve 11 by the electronic control device to reduce the amount of clean water discharged, and the intercepted water volume enters the backwash main pipe 5 through the backwash connection pipe 8, and then enters the filter unit to be backwashed through the backwash branch pipe 6 and the backwash inlet valve 7. Secondly, the external water pump 14 is connected to the backwash connection pipe 8, and the external water pump 14 provides pressurized water and delivers it to the backwash main pipe 5.

[0054] Specifically, the first method utilizes the system's own purified water as the backwash water source. By adjusting the flow control valve, the amount of purified water in the reuse pipe is reduced, and the intercepted water is diverted to the backwash pipeline. This eliminates the need for an additional water source, reducing operating costs. Furthermore, the purified water is clean and will not introduce new impurities that could contaminate the filter element 105. This method is suitable for scenarios where the system is operating normally and the purified water output meets the backwash requirements. The second method is a backup / enhanced solution. When the system's purified water output is insufficient or a stronger backwash pressure is required, high-pressure water is supplied via an external water pump 14, ensuring the backwash effect.

[0055] In one possible embodiment, the type I structure filter unit is installed in the water tank 19 by a bracket. The bottom of the filter unit is at a preset height with the bottom of the tank to form a sludge storage space. The sludge storage space is connected to the inlet of the sludge pump 10 through the sludge discharge pipe 9. The sludge is pumped out by the sludge pump 10 to an external solid-liquid separation device. The Type II structure filter unit is fixedly installed on the ground or suspended above the water tank 19 by the box bracket 101. The hopper 102 at the bottom of the filter unit is used to store backwash sludge. The bottom of the hopper 102 is connected to the inlet of the sludge pump 10 through the sludge discharge pipe 9. The sludge is pumped out by the sludge pump 10 to the external solid-liquid separation device. During backwashing, the sewage inlet valve 4 corresponding to the hopper 102 is kept closed.

[0056] Specifically, the sludge treatment design is tailored to the installation scenarios of the two types of units. Type I filter units are submerged in the water tank 19, and are suspended by a bracket to create a space between the bottom of the unit and the tank bottom. Sludge generated during backwashing can settle naturally, preventing sludge accumulation in the filter chamber 103 and affecting filtration. A sludge discharge pipe 9 connects this space to a sludge pump 10, allowing for periodic sludge removal to an external device to prevent accumulation. Type II filter units lack the water tank 19 for sludge storage; therefore, a hopper 102 is specifically designed to store sludge. During backwashing, the wastewater inlet valve 4 is closed to prevent wastewater from washing away the sludge in the hopper 102 and causing it to re-attach to the filter element 105. The sludge discharge pipe 9 connects the hopper 102 to the sludge pump 10, enabling centralized sludge discharge and preventing sludge accumulation within the system, ensuring the cleanliness of the filter element 105 and the long-term operating efficiency of the system.

[0057] In one possible embodiment, the filter element 105 is a tubular or hollow plate structure with a non-soft surface, and the material is selected from stainless steel, composite materials or ceramics; the flange welded to the outer periphery of the upper end of the filter element 105 is fixed to the upper perforated plate 106 in the water purification chamber 107 by bolts through the upper inspection hole cover plate 108; the lower end of the filter element 105 passes vertically through the perforated plate 106 and is suspended in the filter chamber 103; the filter chamber 103, the water purification chamber 107 and the perforated plate 106 together constitute the main frame of the filter unit assembly 1.

[0058] Specifically, the tubular / hollow plate structure with a non-soft surface is more resistant to ultrasonic vibration and backwashing pressure than soft materials, is less prone to damage, and has a moderate surface smoothness, which facilitates impurity retention and removal during backwashing and ultrasonic cleaning. Stainless steel, composite materials, and ceramic materials all have corrosion resistance and high temperature resistance, making them suitable for the complex water quality of industrial wastewater and extending the service life of the components. The components are fixed by a combination of flanges, bolts, and perforated plates 106. The upper end is fixed to the perforated plate 106 via flanges, and the lower end is suspended from the filter chamber 103. This ensures that the components are vertical, maximizing the filtration area, and facilitates component replacement by removing the inspection port cover 108 and bolts without disassembling the entire filter unit, reducing maintenance difficulty. The main frame consisting of the filter chamber 103, the clean water chamber 107, and the perforated plate 106 provides a stable installation foundation for the filter elements, pipelines, and cleaning devices, ensuring that all components work together.

[0059] In one possible embodiment, the offline backwashing of the filter unit assembly 1 is not performed simultaneously with the ultrasonic cleaning; when a designated filter unit is subjected to ultrasonic cleaning, the electronic control device controls the sewage inlet valve 4, the clean water outlet valve 18, and the backwash inlet valve 7 of the filter unit to be closed, cutting off the sewage supply of the sewage inlet branch pipe 3 and the backwash water supply of the backwash branch pipe 6, so that the filter unit stops filtering and backwashing operations and remains in a relatively static state.

[0060] Specifically, the high water flow rate during backwashing disrupts the stable aquatic environment required for ultrasonic cleaning, weakening the cavitation effect and affecting scale removal. Furthermore, if water flows during ultrasonic cleaning, impurities may be carried away and re-adhere to other areas, reducing cleaning efficiency. Therefore, during ultrasonic cleaning, the electronic control device closes all inlet and outlet valves of the unit to be cleaned, keeping it in a relatively static state. This ensures that the cavitation effect generated by the ultrasonic transducer can fully act on the surface and internal pores of the filter element 105, maximizing the cleaning effect. Simultaneously, the supply of wastewater and backwash water is cut off to prevent unfiltered wastewater or backwash water from entering the unit, ensuring clean water quality within the unit during the cleaning process and preventing the introduction of new impurities.

[0061] See Figure 9 This invention also provides a filtration method integrating in-situ ultrasonic cleaning and compartmented offline backwashing using a type I structure filter unit. The type I structure filter unit needs to be completely submerged in the water tank 19. Continuous operation is achieved through a process of filtration, backwashing, ultrasonic cleaning, and sludge treatment. The specific process is as follows: Filtering stage: Wastewater enters the water tank 19 through the wastewater inlet main pipe 2. Because the filter unit is submerged in water, the wastewater can naturally flow into the filter chamber 103. At this time, the electrical control device controls all backwash inlet valves 7 in the backwash pipeline system to close and the purified water outlet valve 18 to open fully. Under the action of pressure difference, the wastewater flows through the filter chamber 103. Suspended particles and impurities in the water are intercepted by the filter element 105 (tubular / hollow plate type). The filtered purified water passes through the perforated plate 106 into the purified water chamber 107, and then flows through the purified water outlet 111 and the purified water outlet branch pipe 17 into the purified water outlet main pipe 16. At the same time, the water pump 14 starts and draws purified water from the purified water main pipe through the water pump inlet pipe 15.

[0062] Offline backwashing stage for each compartment: When impurities accumulate on the surface of filter element 105, causing a decrease in filtration flux, the electronic control device initiates the backwashing process. First, a single unit to be backwashed is selected, while the remaining units continue normal filtration. Then, the clean water outlet valve 18 of that unit is closed, and the opening of the flow control valve 11 is reduced to decrease the amount of clean water discharged or reused. This allows the water intercepted in the pump outlet pipe 13 to enter the backwash main pipe 5 via the backwash connection pipe 8, and then flow into the clean water chamber 107 through the corresponding backwash branch pipe 6 and backwash inlet valve 7. The backwash water passes through the filter element 105 in the opposite direction to filtration, impacting the impurities trapped on the element surface, stripping them off, and carrying them into the filter chamber 103. Finally, the impurities settle into the sludge storage space between the bottom of the unit and the bottom of the tank (the filter unit is suspended by a bracket, with its bottom maintaining a preset height from the bottom of the tank). During the backwashing process, the remaining units continue filtration, ensuring the entire system remains operational.

[0063] In-situ ultrasonic cleaning stage: To address scale (calcium and magnesium ion crystals) and deep-pore impurities that are difficult to remove with conventional backwashing, the electronic control device initiates ultrasonic cleaning. First, the wastewater inlet (the pool structure allows for natural water level isolation), the purified water outlet valve 18, and the backwash inlet valve 7 of the unit to be cleaned are shut off, bringing the filter unit to a relatively static state. Then, the ultrasonic generator 109 is activated, transmitting high-frequency vibration signals via a shielded cable to the ultrasonic transducer 104 fixed to the inner wall of the filter chamber 103 (both sides / around the filter element 105). The transducer excites the water to generate a cavitation effect, rapidly generating and bursting numerous tiny bubbles. The resulting micro-jet streams and shock waves can peel away scale from the element surface and remove fine impurities from within, achieving deep cleaning. During cleaning, the other units operate normally, and ultrasonic cleaning and backwashing are not performed simultaneously to avoid water flow interfering with the cavitation effect.

[0064] Sludge treatment stage: The sludge generated by backwashing and ultrasonic cleaning settles into the sludge storage space at the bottom of the unit. The electrical control device periodically starts the sludge pump 10 and pumps the sludge in the storage space to an external solid-liquid separation device (such as a filter press) through the sludge discharge pipe 9. The separated clean water flows back to the water tank 19 for re-filtration, while the sludge is treated as solid waste to prevent sludge accumulation and blockage of the filter chamber 103 and ensure the long-term filtration efficiency of the unit.

[0065] See Figure 10 This invention also provides a filtration method integrating in-situ ultrasonic cleaning and compartmented offline backwashing using a Type II structure filter unit. The Type II structure filter unit is fixed to the ground or suspended above the water tank 19 by a box support 101, and requires a hopper 102 for wastewater distribution and sludge storage. The process principle is as follows: Filtering stage: The electrical control device controls the sewage inlet valve 4 on the sewage inlet main pipe 2 and sewage inlet branch pipe 3 to be fully open, the backwash inlet valve 7 to be closed, and the clean water outlet valve 18 to be fully open. Sewage enters the hopper 102 through the sewage inlet main pipe 2, branch pipe, and sewage inlet 112, and then flows into the filter chamber 103. Under the negative pressure generated by the water pump 14, the sewage passes through the filter element 105. After impurities are intercepted, the clean water enters the clean water chamber 107 through the perforated plate 106, and finally flows into the clean water outlet main pipe 16 through the clean water outlet 111 and clean water outlet branch pipe 17. The water pump 14 draws clean water from the clean water main pipe and discharges or reuses it through the fully open flow control valve 11, completing the filtration operation. At this stage, the hopper 102 only serves as a sewage guide and does not store sludge.

[0066] Offline backwashing stage for each compartment: When backwashing is required, the electrical control device selects a single unit to be backwashed, closes its wastewater inlet valve 4 (cutting off the wastewater supply) and clean water outlet valve 18, and reduces the opening of the flow control valve 11. The water intercepted in the pump outlet pipe 13 enters the clean water chamber 107 through the backwash connection pipe 8, backwash main pipe 5, backwash branch pipe 6, and backwash inlet valve 7. The backwash water flows backward through the filter element 105, and the detached impurities fall into the hopper 102 with the water flow (the hopper 102 welded below the filter chamber 103 serves as a temporary sludge storage space at this time). After backwashing is completed, the clean water outlet valve 18 and wastewater inlet valve 4 of that unit are opened to restore filtration; the remaining units always maintain normal filtration to ensure continuous system operation. If the backwash pressure is insufficient, an external water pump 14 can be connected to the flange of the backwash connection pipe 8 to provide high-pressure water to enhance the backwashing effect.

[0067] In-situ ultrasonic cleaning stage: To address scale and deep-seated impurities, the electronic control device closes the wastewater inlet valve 4, the clean water outlet valve 18, and the backwash inlet valve 7 of the unit to be cleaned, preventing interference from wastewater or backwash water. The ultrasonic generator 109 (fixed to the outer wall of the filter chamber 103) is activated, driving the ultrasonic transducer 104 inside the filter chamber 103 via a cable to generate a cavitation effect, removing impurities from the surface and interior of the components. During the cleaning process, the unit stops filtration and backwashing, remaining stationary to ensure stable cavitation effects, while the remaining units operate normally, staggered from the backwashing process.

[0068] Sludge treatment stage: The sludge generated by backwashing and ultrasonic cleaning is collected in the hopper 102. The electrical control device periodically starts the sludge pump 10 to pump the sludge to the external solid-liquid separation device through the sludge discharge pipe 9 at the bottom of the hopper 102. During backwashing, the sewage inlet valve 4 corresponding to the hopper 102 is kept closed to prevent sewage from washing away the sludge and causing it to re-attach to the filter element 105, ensuring that the sludge is completely discharged and maintaining the cleanliness of the unit.

[0069] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A filtration method integrating in-situ ultrasonic cleaning and compartmented offline backwashing, characterized in that, Includes the following steps: Filtration stage: The backwash inlet valves (7) in the backwash pipeline system are closed by the electronic control device, and all the clean water outlet valves (18) in the clean water outlet system are fully opened. The sewage enters the filter chamber (103) of the filter unit assembly (1) through the inlet pipeline. Under the action of pressure difference, it flows through the filter element (105). Suspended particles and impurities are intercepted. The clean water passes through the filter element (105) and enters the clean water chamber (107). Finally, it is discharged through the clean water outlet pipeline. Offline backwashing stage: When the filter flux decreases due to the accumulation of impurities on the surface of the filter element (105), the electronic control device selects a single filter unit to be backwashed and controls the clean water outlet valve (18) of the filter unit to be closed and the sewage inlet valve (4) to be closed simultaneously, while the remaining filter units remain in the filtration state; the flow control valve (11) adjusts the interception system clean water so that the backwash water enters the clean water chamber (107) of the filter unit to be backwashed through the backwash pipeline, passes through the filter element (105) in the opposite direction to the filtration direction, peels off the impurities trapped on the surface, and the impurities settle into the sludge storage space with the water flow; In-situ ultrasonic cleaning stage: For scale and deep impurities on the surface and internal pores of the filter element (105), the electronic control device selects a single filter unit to be cleaned and controls the sewage inlet valve (4), clean water outlet valve (18), and backwash inlet valve (7) of the filter unit to be closed, so that the filter unit stops filtration and backwashing operations and remains relatively still; the ultrasonic cleaning device is started, and the water in the filter chamber (103) is excited by the ultrasonic vibrating plate (104) to generate cavitation effect, and the impact force generated by the generation and rupture of bubbles is used to peel off the scale and deep impurities on the filter element (105); Sludge treatment stage: The sludge pump (10) is started regularly to pump the sludge generated by backwashing and ultrasonic cleaning from the sludge storage space through the sludge discharge pipe (9) to the external solid-liquid separation device to achieve the separation of sludge and water. The compartmentalized offline backwashing stage and the in-situ ultrasonic cleaning stage are not performed simultaneously.

2. The filtration method integrating in-situ ultrasonic cleaning and compartmented offline backwashing according to claim 1, characterized in that, In the filtration stage, the filter unit assembly (1) is a submerged type I structure filter unit or a ground / overhead type II structure filter unit. When the Type I structure filter unit is used, the sewage enters the pool (19) through the sewage inlet main pipe (2) and flows naturally to the filter chamber (103) by relying on the water body; When using a Type II structure filter unit, wastewater enters the hopper (102) through the wastewater inlet main pipe (2), wastewater inlet branch pipe (3) and wastewater inlet (112), and is then guided to the filter chamber (103).

3. The filtration method integrating in-situ ultrasonic cleaning and compartmented offline backwashing according to claim 1, characterized in that, During the offline backwashing stage of the compartment, the backwash water is supplied in two ways: First, the opening of the flow control valve (11) is adjusted by the electronic control device to reduce the amount of clean water discharged. A portion of the water is intercepted and enters the backwash main pipe (5) through the backwash connection pipe (8), and then enters the filter unit to be backwashed through the backwash branch pipe (6) and the backwash inlet valve (7); Second, the external water pump is connected to the backwash connection pipe (8) to provide pressurized water and deliver it to the backwash main pipe (5).

4. The filtration method integrating in-situ ultrasonic cleaning and compartmented offline backwashing according to claim 1, characterized in that, The operation process of the ultrasonic cleaning device is as follows: the ultrasonic generator (109) generates a high-frequency vibration signal, which is transmitted through a shielded cable to the ultrasonic transducer (104) fixed on both sides or around the filter element (105) in the filter chamber (103). The ultrasonic transducer (104) transmits the vibration to the water body and forms a uniform ultrasonic field that acts on the filter element (105).

5. The filtration method integrating in-situ ultrasonic cleaning and compartmented offline backwashing according to claim 1, characterized in that, In the sludge treatment stage: when using a type I structure filter unit, the filter unit is installed in the water tank (19) by a bracket, and the bottom of the filter unit is at a preset height with the bottom of the tank to form a sludge storage space. When using a Type II structure filter unit, the hopper (102) connected below the filter chamber (103) serves as a sludge storage space, and the sewage inlet valve (4) corresponding to the hopper (102) remains closed during backwashing.

6. A filtration system integrating in-situ ultrasonic cleaning and compartmented offline backwashing, used in the filtration method integrating in-situ ultrasonic cleaning and compartmented offline backwashing as described in any one of claims 1 to 5, characterized in that, It includes a backwashing pipeline system, a purified water outlet system, a water pump (14), a flow control valve (11), a backwashing connection pipe (8), a sludge discharge pump (10), and a filter unit assembly (1), wherein the filter unit assembly (1) is a submerged type I structure filter unit or a ground-mounted type II structure filter unit. The backwash pipeline system includes a backwash main pipe (5), backwash branch pipes (6) and a backwash inlet valve (7). The type I structure filter unit is composed of the backwash pipeline system, the purified water outlet system, the water pump (14), the flow control valve (11), the backwash connection pipe (8), and the sludge discharge pump (10) to form a filter system. The Type II structure filter unit is composed of the backwash pipeline system, the purified water outlet system, the water pump (14), the flow control valve (11), the backwash connection pipe (8), the sludge pump (10), the sewage inlet main pipe (2), the sewage inlet branch pipe (3), and the sewage inlet valve (4) to form the second filter system.

7. The filtration system integrating in-situ ultrasonic cleaning and compartmented offline backwashing according to claim 6, characterized in that, Both the Type I and Type II filter units include a filter chamber (103), a filter element (105), a perforated plate (106), a purified water chamber (107), an inspection hole cover (108), a backwash water inlet (110), and a purified water outlet (111). The perforated plate (106) is horizontally arranged inside the filter unit, dividing the purified water chamber (107) and the filter chamber (103) into two independent spaces. The filter element (105) passes vertically through the perforated plate (106), with its upper end fixed inside the purified water chamber (107) and its lower end extending into the filter chamber (103). The backwash water inlet (110) is connected to one side of the purified water chamber (107), and the purified water outlet (111) is connected to the other side. The inspection hole cover (108) is provided on the top of the purified water chamber (107). The bottom of the Type II structure filter unit is also fixedly connected to a box support (101), and a hopper (102) is welded below the filter chamber (103). A sewage inlet (112) is connected to one side of the hopper (102), and a sludge outlet (113) is connected to the bottom of the hopper (102).

8. The filtration system integrating in-situ ultrasonic cleaning and compartmented offline backwashing according to claim 7, characterized in that, In the backwash pipeline system, one end of the backwash branch pipe (6) is welded to the backwash main pipe (5), and the other end of the backwash branch pipe (6) is connected to the backwash water inlet (110) of the filter unit assembly (1) through the backwash water inlet valve (7). The purified water outlet system includes a purified water outlet main pipe (16), purified water outlet branch pipes (17) and a purified water outlet valve (18). One end of the purified water outlet branch pipe (17) is welded to the purified water outlet main pipe (16), and the other end of the purified water outlet branch pipe (17) is connected to the purified water outlet (111) of the filter unit assembly (1) through the purified water outlet valve (18). The water pump inlet pipe (15) of the water pump (14) is connected to the clean water outlet main pipe (16), and the water pump outlet pipe (13) of the water pump (14) is connected to the backwash connection pipe (8) and the clean water discharge / reuse pipe (12) respectively through a tee. The flow control valve (11) is connected to the clean water discharge / reuse pipe (12).

9. The filtration system integrating in-situ ultrasonic cleaning and compartmented offline backwashing according to claim 8, characterized in that, It also includes an ultrasonic cleaning device, which includes an ultrasonic generator (109) and an ultrasonic transducer (104), the ultrasonic generator (109) and the ultrasonic transducer (104) being detachably electrically connected by a shielded cable. The ultrasonic transducer plate (104) is fixed to the inner walls of the filter element (105) on the left and right sides or around the filter chamber (103) by bolts.

10. The filtration system integrating in-situ ultrasonic cleaning and compartmented offline backwashing according to claim 9, characterized in that, The ultrasonic generator (109) of the type I structure filter unit is fixedly installed on the outside of the water tank (19) by a bracket and electrically connected to the ultrasonic transducer (104) in the filter chamber (103) by a cable. The ultrasonic generator (109) of the type II structure filter unit is fixed to the outer wall of the filter chamber (103) by bolts and is electrically connected to the ultrasonic transducer (104) inside the filter chamber (103) by cable.

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